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Printing plate mesh tension and screen frame size
Time：【2015-3-25】 All【】次 【Print】 【Back】
The unit of measurement of the tension is N / cm; mesh stretching process, the measurement will make use of measuring instruments to measure the tension of this parameter. In short, the higher the reading on the tension measuring instruments, Buda to the printing results will be better. The tension of the mesh has the following advantages:It can reduce the frequency of non-contact printing of mesh printing press registration printing results become better.
Compared with the mesh relaxation of the printing press, the printing pressure of the tight mesh of the printing press required. This sounds confusing, because not fully tensioning the mesh need to upgrade to a higher level, to get better printing results. In practice, however, in the mesh to enhance the process, the press need to provide a higher pressure of the roller, which would greatly increase the printed knife folding, stain and templates rupture occurrence probability of the printing problem.
Compared with those not fully tensioning the screen, appropriate tensioning of the wire mesh of a longer service life.
Moderate tension of the wire mesh more easily wrapped and recycling to improve the quality of template exposure.
Tensioned screen of the handheld only 1 or 2 N / cm tension state, the uneven distribution and the tension of the wire-line. 40 Newton screen compared with those tension levels, this manual operator tensioned screen is certainly safe, but they are less than good printing results. This is like driving a car, who do not want to driving a wheel not played in the gas vehicles on the road Mercedes-Benz. Of course, the smaller size can be repeatedly stretched stencil price is relatively cheap, users can choose according to their actual operating conditions.
Stretching limit
If more tightly as possible, then, why do not mesh pulled 50-100 N / cm tension state?
The mesh can withstand the tension of a certain, beyond this tension, the mesh appears to break down, or falling down from the network box.
Affected by the tension, the screen frame is very prone to curvature, the size of the curvature will change with the size of the screen frame size. In general, the larger the network box the smaller and more able to withstand tension (30 N / cm or greater). However, once the screen frame size actually achieved beyond three square feet (even a little bit), the tension is in the range of 15-25 N / cm. In addition, for those large size screen frame and bracket or other support structure to prevent it from bending.
Due to design reasons, some high-tension, low elongation mesh will not be the first question, and allows the use of high tension level of the network board. Even so, the user is best to comply with the requirements of the manufacturer on screen tension level.
Frame size
Appropriate screen frame size is defined by the printed image. Roller and image the inside of the framework should be at least a distance of 4 inches apart (measured at the horizontal plane of the image) to meet the printing presses running and outage needs. In addition, any roller side away from the framework of the inside of the margins should be greater than 3 inches. Under normal circumstances, the size is 11 inches x15 inches image size of 17 inches x23 inches (at least) the framework in order to eliminate the printing problem. Printed material, the greater the space surrounding the printing effect the easier it is to achieve high standards. Should the distance between the image and the mesh is too narrow, the printing process, it would be easy printing, including printing stain, the drain side distortions.